Meanwhile the Corinthian fleet from Leucas made all haste to arrive; and one of their commanders, Gongylus, starting last with a single ship, was the first to reach Syracuse, a little before Gylippus. Gongylus found the Syracusans on the point of holding an assembly to consider whether they should put an end to the war. This he prevented, and reassured them by telling them that more vessels were still to arrive, and that Gylippus, son of Cleandridas, had been dispatched by the Lacedaemonians to take the command. Upon this the Syracusans took courage, and immediately marched out with all their forces to meet Gylippus, who they found was now close at hand. Meanwhile Gylippus, after taking Ietae, a fort of the Sicels, on his way, formed his army in order of battle, and so arrived at Epipolae, and ascending by Euryelus, as the Athenians had done at first, now advanced with the Syracusans against the Athenian lines. His arrival chanced at a critical moment. The Athenians had already finished a double wall of six or seven furlongs to the great harbour, with the exception of a small portion next the sea, which they were still engaged upon; and in the remainder of the circle towards Trogilus on the other sea, stones had been laid ready for building for the greater part of the distance, and some points had been left half finished, while others were entirely completed. The danger of Syracuse had indeed been great.

Meanwhile the Athenians, recovering from the confusion into which they had been first thrown by the sudden approach of Gylippus and the Syracusans, formed in order of battle. Gylippus halted at a short distance off and sent on a herald to tell them that, if they would evacuate Sicily with bag and baggage within five days' time, he was willing to make a truce accordingly. The Athenians treated this proposition with contempt, and dismissed the herald without an answer. After this both sides began to prepare for action. Gylippus, observing that the Syracusans were in disorder and did not easily fall into line, drew off his troops more into the open ground, while Nicias did not lead on the Athenians but lay still by his own wall. When Gylippus saw that they did not come on, he led off his army to the citadel of the quarter of Apollo Temenites, and passed the night there. On the following day he led out the main body of his army, and, drawing them up in order of battle before the walls of the Athenians to prevent their going to the relief of any other quarter, dispatched a strong force against Fort Labdalum, and took it, and put all whom he found in it to the sword, the place not being within sight of the Athenians. On the same day an Athenian galley that lay moored off the harbour was captured by the Syracusans.